Powertrain
generic / SAE
P2D1D
Reductant System Leak Detected – Small Leak
The SCR module detects a small leak in the reductant system based on pressure decay rate after dosing pause. Slow loss of DEF/AdBlue.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / numberD / 1D
Possible causes
- Fitting or connection loose high
- Seal aged at injector or pump medium
Symptoms
- Check engine light or NOx warning on
- AdBlue/DEF level or quality warning
- Possible no-start countdown after ignore period
- Failed emissions inspection (NOx)
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 150–1500 €
- Estimated time: 1–6 h
- Component: reductant lines
- Component: reductant injector
- Component: reductant pump
- Component: scr module
- MIL / check engine light
- emissions-relevant
- drive cycle required
- limp mode possible
Sources
References
sae:J2012